Donna Troy, by patiencerose.
Not quite a redesign per se, but this is one of the few occasions where I actually covet Donna Troy’s original Wonder Girl costume, due to the slightest clothing and design modifications.

Donna Troy’s first appearance in The Brave and the Bold, vol. 1 #60
In patiencerose’s illustration, the boat neck is softer and less boxy, which allows the top to drape better for a more flattering fit. The high neckline and loose fit of the top is complemented by a pair of comfortable high-waisted bloomers, which creates a more balanced and youthful silhouette than her original pair of spandex hot-pants. Finally, the look is pulled together by her classic gladiator sandals and wristbands.
It goes to show even that the slightest modification in fit, necklines, hemlines, coordinating, and draping can instantly revive and update your favorite pieces/outfits, as well as articles of clothing that just seem to fit a little off. You’ll be looking like a wonder in no time!